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Tractor Talk Discussion Forum

case ih 685 4 wheel drive

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12-10-2004 15:32:08

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my 685 stays in four wheel drive all the is electric i have power to the switch on the dash.can not seem to locate the switch on the transmission to check it.can anybody help me.thanks

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12-10-2004 20:41:49

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 Re: case ih 685 4 wheel drive in reply to carroll, 12-10-2004 15:32:08  
ras i see a place on the right side looks like it has hydraulic lines going in it on the side of this box with a square plate on front with four bolts box about 3-4 inchs squire.will i see wires going in to this box.and is there anything else to look for. thanks

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Rod F.

12-11-2004 19:13:17

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 Re: case ih 685 4 wheel drive in reply to carroll, 12-10-2004 20:41:49  
A ZF transfer case should be power up, FWD disengaged. Power down, FWD engaged. If you have power on the solenoid, you likely have a weak solenoid. They still spark a bit, and will click enough to screw with your head and make you think it works. A weak solenoid will work to some degree. It is more noticeable on the road. If you disengage the FWD at road speed, you should notice the difference in noise. A weak solenoid will then gradually allow oil to seep through and reenergise the FWD. Noise/whine will gradually grow louder. Let's hope for a bad fuse. Solenoids are several hundred bucks, and odds are, the solenoid is bad. HTH.


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12-11-2004 20:04:16

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 Re: case ih 685 4 wheel drive in reply to Rod F., 12-11-2004 19:13:17  
i am going to check my wiring again tomorrow i bought tractor used everything was working but the either switch.thought i would get it working sometimes i have to park this tractor were i don't have electric for heater.then i found out where somebody had been screwing with the wires i guess fuse block went bad. how do you remove the solonoid if i need to.thanks rod f and ras i found the cover the wire was in a tube like a hydraulic line.thanks

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Rod F.

12-12-2004 06:17:34

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 Re: case ih 685 4 wheel drive in reply to carroll, 12-11-2004 20:04:16  
From your description, it sounds like the same setup as my Fords have. That tube with the wire inside runs into a square box that has a plate cover held on with 4 bolts. Take that cver off, and you will likely need an allen key to get 2 screws out that retain the solenoid. Before you pull the solenoin, you can easily check for voltage to the solenoid, and rule out bad wires. The solenoid should just pull straight out once the 2 retaining screws are removed. as I said, I am just assuming that this is set up the same as the Fords, as they both sourced their FWD systems from ZF. HTH.


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12-10-2004 15:44:52

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 Re: case ih 685 4 wheel drive in reply to carroll, 12-10-2004 15:32:08  
On the right side of the MFD gear box you should see a plate with 4 bolts. Remove that plate and you will find the solenoid.

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